[SIS-xxx] enabling external configuration of db pool size

deployment/helm/sissi/templates/deployment.yaml

@@ -84,6 +84,10 @@ spec:
                 secretKeyRef:
                   name: api-keys
                   key: twitchSecret
+            {{- range $key, $value := .Values.bot.propertyConfig }}
+            - name: {{ $key | quote }}
+              value: {{ $value | quote}}
+            {{- end }}
           ports:
             - name: http
               containerPort: {{ .Values.service.port }}